Asco P159A121X1X21F0 120V On/Off Fast-Opening Damper Shaft Actuator NEMA Type 1

The Asco P159A121X1X21F0 is a 120V On/Off electrohydraulic actuator from the ASCO Series 159 product line, engineered for reliable gas shut-off and damper control in commercial and industrial heating applications. Operating at 120V/60Hz or 110V/50Hz, this fast-opening actuator delivers precise, repeatable on/off control for demanding HVAC and combustion system environments.

This model features a damper shaft mounting configuration (without arm) and uses a 1/2" NPT electric connection fitting for straightforward conduit wiring. The actuator carries a NEMA Type 1 general-purpose enclosure rating and includes no auxiliary switch or proof-of-closure switch — making it a clean, cost-effective solution when positional feedback is not required.

Key Features:

• On/Off control type for simple open/close operation
• Fast-opening actuation for responsive system control
• 120/60V or 110/50V AC dual-voltage compatibility
• Damper shaft mounting without arm for direct valve shaft coupling
• 1/2" NPT electrical conduit connection fitting
• NEMA Type 1 general-purpose enclosure rating
• No auxiliary switch or proof-of-closure switch (clean wiring, minimal complexity)
• Built-in position indicators on both sides for easy valve status monitoring
• Designed for use with ASCO Series 158 gas valves

The Asco Series 159 actuator is well-suited for use with boilers, furnaces, ovens, dryers, incinerators, and thermal oxidizers. When paired with an ASCO Series 158 gas valve body, the assembly forms a globally recognized safety shut-off solution for combustion control systems.